The Virginia Department of Conservation and Recreation has a pretty extensive website covering invasive species specific to Virginia: http://www.dcr.virginia.gov/natural_heritage/vaisc/. Note that the USDA doesn’t necessarily regulate all of these, but the state does. The reasons for this can vary (it may not be an agricultural pest, may be a priority only in the state and a state management program makes more sense, etc.).

A quarantine is the restriction or prohibition of activities or movements that is imposed to prevent the spread of contagious diseases or pests. USDA and/or the states may have quarantines in place to prevent the spread of citrus pests and diseases. USDA takes several different steps to protect the industry in citrus producing states, including:

”Inspection of host plants at international ports, state lines, airports and mail-sorting facilities.

”Confiscation of illegally shipped plants.

”Many areas in the United States are under quarantine for citrus greening or Asian citrus psyllids, including Florida, Georgia, Puerto Rico, U.S. Virgin Islands and portions of Louisiana and South Carolina.

”Citrus fruit from Florida must be packed at a certified packinghouse, properly disinfected for citrus canker and accompanied by a USDA certificate.

”Industry's removal of infected trees to prevent the spread to healthy trees.

”Aggressive public education efforts at the national and state level to create awareness of these serious threats.

Here is a list of the states where quarantines related to citrus pests and diseases are in place:

Texas — Federal quarantine for Asian citrus psyllid and sweet orange scab. A small portion of Hidalgo County in Texas is quarantined for citrus greening disease.

Florida — under quarantine for citrus greening disease, Asian citrus psyllid, citrus canker and sweet orange scab. A small area of southwest Florida is under quarantine for citrus black spot.

Georgia — under quarantine for citrus greening disease and the Asian citrus psyllid.

Guam — entire island is under quarantine for Asian citrus psyllid.

Hawaii — all islands under quarantine for Asian citrus psyllid.

Louisiana — two parishes are under quarantine for citrus greening disease. The entire state is under quarantine for Asian citrus psyllid and sweet orange scab.